docs: oas (#197)

Adds OpenAPI specification of Storefront and Admin APIs.
Updates docs project.

docs-util/helpers/setup-server.js

@@ -0,0 +1,30 @@
+const path = require("path");
+const { spawn } = require("child_process");
+
+const { setPort } = require("./use-api");
+
+module.exports = ({ cwd }) => {
+  const serverPath = path.join(__dirname, "test-server.js");
+
+  return new Promise((resolve, reject) => {
+    const medusaProcess = spawn("node", [path.resolve(serverPath)], {
+      cwd,
+      env: {
+        ...process.env,
+        NODE_ENV: "development",
+        JWT_SECRET: "test",
+        COOKIE_SECRET: "test",
+      },
+      stdio: ["ignore", "ignore", "inherit", "ipc"],
+    });
+
+    medusaProcess.on("uncaughtException", (err) => {
+      medusaProcess.kill();
+    });
+
+    medusaProcess.on("message", (port) => {
+      setPort(port);
+      resolve(medusaProcess);
+    });
+  });
+};